EP 0231994 A2 19870812 - Clutch-to-clutch coast downshift control for a motor vehicle transmission.
Title (en)
Clutch-to-clutch coast downshift control for a motor vehicle transmission.
Title (de)
Steuereinrichtung zum Herunterschalten eines Fahrzeuggetriebes im Schiebebetrieb zwischen zwei mittels Kupplungen schaltbaren Übersetzungen.
Title (fr)
Dispositif de commande pour le changement à une vitesse inférieure d'une boîte de vitesses de véhicule automobile en frein-moteur entre deux rappÔts d'engrenage à changement par des embrayages.
Publication
Application
Priority
US 82239786 A 19860127
Abstract (en)
In a motor vehicle automatic transmission, clutch-to-clutch downshifts in the course of a coast mode of operation are effected by releasing an off-going clutching device (28 to 32) at a time determined in relation to vehicle speed and deceleration rate, and applying an on-coming clutching device a predermined time thereafter such that apply occurs when the engine speed is substantially equal to the transmission input speed in the downshifted speed ratio. The predetermined time defines an neutral interval during which the on-coming clutching device is filled with hydraulic fluid in preparation for engagement, and the engine speed assumes its neutral idle value. At the end of the predetermined time, the engine speed and the transmission input speed in the downshifted speed ratio are at the neutral idle value, and the on-coming clutching device is applied to complete the shift.
IPC 1-7
IPC 8 full level
F16H 61/08 (2006.01); F16H 61/02 (2006.01); F16H 61/06 (2006.01); F16H 63/42 (2006.01); F16H 59/18 (2006.01); F16H 59/38 (2006.01); F16H 59/46 (2006.01); F16H 61/04 (2006.01); F16H 61/21 (2006.01); F16H 61/684 (2006.01)
CPC (source: EP US)
F16H 61/061 (2013.01 - EP US); F16H 61/08 (2013.01 - EP US); F16H 61/21 (2013.01 - EP US); F16H 61/684 (2013.01 - EP US); F16H 2059/186 (2013.01 - EP US); F16H 2059/385 (2013.01 - EP US); F16H 2059/467 (2013.01 - EP US); F16H 2061/0255 (2013.01 - EP US); F16H 2061/044 (2013.01 - EP US); Y10T 74/19153 (2015.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
US 4671139 A 19870609; CA 1273424 A 19900828; DE 3761416 D1 19900222; EP 0231994 A2 19870812; EP 0231994 A3 19871216; EP 0231994 B1 19900117; JP H0541860 B2 19930624; JP S62184269 A 19870812
DOCDB simple family (application)
US 82239786 A 19860127; CA 519395 A 19860930; DE 3761416 T 19870106; EP 87300058 A 19870106; JP 1533187 A 19870127